Veneering press and the like



\ g- 1 94 A. FlSCHER-SCHMUTZ 2,252,040

VENEERING PRESS AND THE LIKE Filed June 28, 1938 2 Sheets-Sheet l flaw/iv:

Aug. 12, 1941.

A. FISCHER-SCHMUTZ 2,252,040 VENEERING PRESS AND THE LIKE Filed June 28, 1938 -2 Sheets-Sheet 2 MW III/III,fill/III:"111%IIIIIIIIIlI/{IIIIIIAg I 'a Patented Au 12, 1941 'divided into two chambers,

Adolf Fischer-Schmutz, Basel, Switzerland Application June 28, 1938, Serial No. 216,383 In Switmrland July I, 1937 3 Claims. (01. 144-281) Prior art veneering presses are known which include a pressure container, closed by a mat of rubber or the like on its side opposite the work.- supporting table, and pressure is exerted on the work from this container by means of high pressures produced in the latter. A disadvantage of this type of press is that it requires intermittent and alternate raising and lowering of the pressure therein, upon the introduction and/or removal of a work piece from the supporting table.

This procedure is undesirably time-consuming.

The purpose of the invention is to provide a more economical pressing device of the above mentioned kind, in which according to theinvention a drum is used, divided by a partition into two chambers which can be charged from outside and are in closable connection with a source of air under pressure, the drum being rotatable on a horizontal axis in such away that while in one chamber a wooden piece placed on the partition stands under the pressure of air through the agency of a mat spread over it, for the purpose of pressing plies together or for veneering,

such as for instance a compressor n diagrammatically indicated in Figure 1 through closing members 11 n (stop valves) also diagrammati-- cally indicated in Figure 1, and are in addition connected with one another by a pipe d 'provided with a stop cock (1. The partition b is constructed as a double walled heating plate with cross passages in which heating resistances e are arranged. Further heating resistances e are carried in longitudinal tubes 1 which are secured chambers a a have doors h at one end by which the drum can be rotated on the horizontal axis so that the other chamber can be charged with tinuous working operation is made possible.

An example of embodiment of the invention is shown in the accompanying drawings.

Figure 1 shows the complete apparatus, Figure 2 is a longitudinal section of the drum Fig. his a cross-sectional detail .on an larged scale, taken along line 211-201 of Fig. 2.

Figure 3 is a cross section on the line IIIIII of Figure 2,

Figures 4 and 5 show similarly to Figures 2 and 3, alongitudinal section and a cross section ofthe same drum, but.with somewhat differently charged chambers.

Fig. 5a is a cross-sectional detail onan enlarged scale taken along line Sir-5a of Fig. 5.

they can be opened and hermetically closed.

The compressor n may be of any desired size and/or capacity. It is preferably capable of generation an air pressure of 6 atmospheres. The pipes (1 d which interconnect the compressor and chambers a a are of sufiicient length to enable the drum a to be rotated through at least a revolution in order to bring either chamber 11 or a to the uppermost position.

- For gluing together of plies or for veneering curved wooden pieces by the aid of the press A, use is made of a base plate i lying on a table B,

. upon which plate the first wooden piece prepared as possible on the wooden piece 1', and the mat pressed at its margins against the plate i by a The press for pressing wooden plies together or for veneering, more patricularly a curved wooden object, as shown in Figs. 1, 2 and 3, in-

- cludes a press A actuated by air under pressure,

comprising a horizontally arranged rotary drum a divided into two chambers a and a by a partition 12., This drum 0 has on its exterior two guide rails awhich rest on rollers c on a base support c so that the drum 0. can be rotated at will in either direction about its horizontal axis. The two chambers a a are connected by respective pipes (1 d with a source of air under pressure,

is pushed into the open chamber a on to the partition b with. which it makes a substantially air tight fit round its margins. The chamber a is then hermetically closed, the electric heating resistances e, e switched on and the chamber a then put under an air pressure of about 6 atmos-.

pheres through pipe (1 by opening valve n, which has the result that the wooden piece lying under the mat 0 is put under pressure for veneering by the pressure of the gradually warming air on the mat. In the meantime the chamber a is brought uppermost by rotating the drum a and in the same way as chamber a is charged with a work piece to be pressed which is also covered with a rubber mat. The chamber a is then closed air I tight and the stop cock it opened so that the .thisway a-saving of heated air under pressure is efiected. Now after closing the cock d the chamber a is again brought uppermost by rotating the drum and the air under pressure released to enable the finished piece to be removed, while the air pressure in the chamber a, now in the lowermost position, is raised to 6 atmospheres by opening valve n of the pipe d in order to press the'piece in this chamber in a similar way to that in chamber a In this way the chamber -a a can be charged alternately with workpieces in a continuous working operation, so that the described apparatus can be worked very economically. So that air which may still be present beneath the rubber mat when either of the chambers a a is charged, can escape, holes i are provided in the plates i and shallow grooves 11 communicating with the outside air, as shown in Fig. 2a in both faces of the wall b.

Instead of electrically, the chambers (1 a and the partition b could be heated by means of hot water or steam.

In addition to being charged each with one frame p has been placed around the charge to prevent the mat o from being forced in between the plates 8, s and i by the air under pressure. Beyond this the procedure is as above described; after the mat 0 has been pressed around its margins by the fram 7:: and the clamps m acting thereon, the whole charge unit is pushed into the chamber a}, the chamber after closing put under heat and air pressure and the drum 10 then rotated for charging the chamber a in the same way as chamber a and so on. v

What I claim is: 1. A pressing apparatus of the character described comprising a drum rotatable on a horizontal axis, a fiat transverse diametrically-extending partition in said drum dividing the lat-' ter into two separate hermetically-closable chambers, heating means located in said partition, valve-controlled conduit means for inde- 26 pendently and alternately interconnecting each curved workpiece, the two chambers a and a the respective faces of said partition, said supcan be charged with wooden panels to be veneered or to have their plies glued together, as shown in Figures 4 and 5. For this purpose, starting again with chamber a on the carrying plate i e for example two additional heating plates '8 and s are provided in superposed arrangement, which are connected at their ends with one another and with the plate 1' by linkages 1). One of the panels u, a which, for example, is to be built up by gluing plies together, is inserted between the members i and s and the other between the -member s ands To permit this insertion of the panels u and u the two heating plates '3 and s are raised as much as necessary by a lifting device as for instancea screwing device w as indicated in Figures 5 and 5a. On the uppermost heating plate, a mould t is placed on which of said chambers with a source of air under pressure, a valve-controlled conduit interconnecting said two chambers, work-supp rting'means for each said chamber adapted to be seated on porting means including a base plate, a flexible mat of air-impervious material covering the work, a frame for pressing the margins of said mat against said base plate and a clamping de- 30 vice for securing said base plate and frame torality of heating plates in superposed arrangea curved workpiece t consisting of a plurality ment on said base plate and a frame adapted to be placed around these superposed heating plates to prevent air pressure from forcing said mat between said heating plates.

ADOLF FISCHER-SCHM'U'IZ. 

